| dc.description | Electrical properties of porous ZrO2:8 mol% Y2O3 ceramics with LiF sintering aid were
studied. The specimens were sintered by transient liquid phase formation under the
application at 650??C of 200 V cm-1 AC electric field for various current density, current
elapsed time, and lithium fluoride content. Low electric current densities coupled with long
application times produced homogeneous specimens. Variations in the electric current
density and current elapsed time allowed to obtain sample densification in the 60%-75%
range. Impedance spectroscopy measurements were carried out to estimate the relative
pore content, evaluating the product of the blocking factor ??R (=Rg/(Rg +Rgb), R, g and gb
stand for resistance, grain and grain boundary, respectively) to the frequency factor ??f (=
fgb/fg, f is the characteristic frequency), which is proportional to the blocker volume, i.e., the
porosity. A direct correspondence between ??R?????f and the apparent porosity, obtained after
determining the apparent density by the Archimedes method, was observed. | |
